管内穿放视频线 SYV-75-12，其中“12”是指（ ）。
A、阻抗大小
B、线芯大小
C、屏蔽层密集程度
D、以上都不对

单项选择题GMFM采用不能启动或完全不能做、启动、部分完成和完成4个等级标准对脑瘫儿童的粗大运动发育功能进行评价。 A、正确 B、错误

单项选择题9. Which would historians not consider as one of reasons of America’s entry into WWI? A、American merchant ships were sunk on the high sea by German submarines. B、Woodrow Wilson was dissatisfied with a new hat he bought during Jan. 1917. C、British government had a propaganda machine at work in the United States. D、American political leaders had a deep concern over the balance of power in Europe.